First time hatching eggs with my broody hen question about temperature

[byouland]

My barred rock has been broody for 10 days so I decided to get some fertilized eggs. It's only been a few days that she's been sitting on the eggs, but now the temperature has dropped to 50 degrees. Unfortunately my hen hasn't left the nesting box in 3 days. Prior to the cold temperatures she use to leave the nesting box once a day to do her business, but now she hasn't had the opportunity to do so. Should I be doing anything to help make the coop warmer than 50 degrees or just let her keep her eggs nice and warm herself?

 

[spotsplus]

Under the hen is very warm. I wouldn't worry about the eggs being warm enough. I would be concerned about your hen losing weight and not drinking. I'd take her off the nest during the warmest part of the day to encourage her to do her business, eat and drink.